eudiometer

(yo̵̅o̅′dē ämət ər)

noun

an instrument for measuring and analyzing gases volumetrically, originally for measuring the amount of oxygen in the air to determine its purity

Origin: < Gr eudios, clear, fair (< eudia, fair weather < eu- (see eu-) + dia, day < IE *diw-, glowing day < base dei-, to shine > deity) + -meter

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